* Reverted Bios to ORIGINAL version System Crashes during Boot (indicating issue with AppleIntelCPUPowerManagement.kext)

YES, I checked the BIOS setting after the upgrade and subsequent downgrade, to be sure that the setting were SAME as before.It seems like a BIOS update changed the way the HARDWARE responds to thevery same SOFTWARE. Bios was updated with Intel universal Bios install on USB stick.

To be SURE, I did this on two different machines and the results were the same.Yes, if I install /Extra/Extensions/NullCPUPowerManagement.kextThen I am able to boot, but of course the System is Unable to SLEEP.

I could use some Words of Wisdom by someone who understands the Bigger Picture.

Yes, a BIOS upgrade or even changing BIOS settings can do that.Make sure your BIOS settings are the same as they were when you installed OS X with the old BIOS and, if you were using a patched DSDT before upgrading your BIOS, redump your DSDT and apply the same patches to it all over again.